function navrollover(button) {
		document.getElementById(button).src = "images/navigation/"+button+"_over.png";
	}
	
	function navrollout(button) {
		document.getElementById(button).src = "images/navigation/"+button+".png";
	}
	
	function galrollover(image,imageid) {
		document.getElementById(imageid).src = "gallery/thumbnails/"+image;
	}